Which structure could be injured to cause weakness of the gluteus medius?

• A. Inferior gluteal nerve
• B. Superior gluteal nerve or L5 root
• C. Femoral nerve
• D. Obturator nerve

Answer: (B)

The correct choice is the superior gluteal nerve or the L5 root, as it is primarily responsible for the innervation of the gluteus medius muscle. The gluteus medius plays a crucial role in stabilizing the pelvis during walking and facilitating hip abduction.

When the superior gluteal nerve is injured, it can lead to weakness in the gluteus medius, resulting in difficulties in hip abduction and pelvic stabilization. This injury can arise from trauma, compression, or surgical complications. The L5 nerve root contributes to the innervation and function of this muscle as well, and any compromise at this level can affect the muscle's strength and performance.

Injuries to the inferior gluteal nerve, femoral nerve, or obturator nerve would not lead to weakness specifically in the gluteus medius. The inferior gluteal nerve primarily innervates the gluteus maximus, while the femoral nerve is associated with the quadriceps and hip flexors. The obturator nerve primarily innervates adductor muscles of the thigh. Therefore, none of these nerves would significantly impact the gluteus medius' functionality. This specificity clearly highlights why the superior gluteal nerve or L